# Chapter 18 : Rectilinear Figures - Frank Solutions for Class 9 Maths ICSE

Mathematics in ICSE Class 9 is one of the most challenging and trickiest subjects of all. It includes complex topics such as logarithms, expansions, indices and Pythagoras Theorem which are difficult to understand for an average student. TopperLearning provides study materials for ICSE Class 9 Mathematics to make the subject easy and help students to clear all their concepts. Our study materials comprise numerous video lessons, question banks, revision notes and sample papers which help achieve success in the examination.

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## Chapter 18 - Rectilinear Figures Excercise Ex. 18.1

Question 1 Solution 1 Question 2 Solution 2 Question 3 Solution 3 Question 4 Solution 4 Question 5 Solution 5 Question 6 Solution 6 Question 7 Solution 7 Question 8 Solution 8 Question 9 Solution 9 Question 10 Solution 10 Question 11 Solution 11 Question 12 Solution 12 Question 13 Solution 13 Question 14 Solution 14 Question 15 Solution 15 Question 16

Is it possible to have a polygon whose sum of interior angles is 780°?

Solution 16 Question 17

Is it possible to have a polygon whose sum of interior angles is 7 right angles?

Solution 17 Question 18

Is it possible to have a polygon whose each interior angle is 124°?

Solution 18 Question 19

Is it possible to have a polygon whose each interior angle is 105°?

Solution 19 Question 20

A heptagon has three angles equal to 120°, and the other four angles are equal. Find all the angles.

Solution 20 Question 21 Solution 21  Question 22

In a polygon, there are 3 right angles and the remaining angles are equal to 165°. Find the number of sides in the polygon.

Solution 22 Question 23

ABCDE is a pentagon in which AB is parallel to DC and Find angle A.

Solution 23  Question 24

If the difference between an exterior angle of a regular polygon of 'n' sides and an exterior angle of another regular polygon of '(n + 1)' sides is equal to 4o; find the value of 'n'.

Solution 24 Question 25

The number of sides of two regular polygons are in the ratio 2 : 3 and their interior angles are in the ratio 9 : 10. Find the number of sides of each polygon.

Solution 25 Question 26 Solution 26 Question 27 Solution 27 Question 28 Solution 28 Question 29 Solution 29 Question 30 Solution 30 Question 31 Solution 31 Question 32 Solution 32 Question 33 Solution 33 Question 34 Solution 34 Question 35 Solution 35  Question 36 Solution 36  Question 37

In a regular pentagon PQRST, PR = QT intersect at N. Find the angle RQT and QNP.

Solution 37  Question 38

Each exterior angle of a regular polygon is times of its interior angle. Find the number of sides in the polygon.

Solution 38 Question 39

Each interior angle of a regular polygon is 162°. Another regular polygon has number of sides double the first polygon. Find each interior angle of the second polygon.

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